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Oracle Updated 1z0-830 Exam Questions and Answers by tomas

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Oracle 1z0-830 Exam Overview :

Exam Name: Java SE 21 Developer Professional
Exam Code: 1z0-830 Dumps
Vendor: Oracle Certification: Java SE
Questions: 84 Q&A's Shared By: tomas
Question 20

Given:

java

record WithInstanceField(String foo, int bar) {

double fuz;

}

record WithStaticField(String foo, int bar) {

static double wiz;

}

record ExtendingClass(String foo) extends Exception {}

record ImplementingInterface(String foo) implements Cloneable {}

Which records compile? (Select 2)

Options:

A.

ExtendingClass

B.

WithInstanceField

C.

ImplementingInterface

D.

WithStaticField

Discussion
Atlas
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Question 21

Which of the following isn't a valid option of the jdeps command?

Options:

A.

--check-deps

B.

--generate-open-module

C.

--list-deps

D.

--generate-module-info

E.

--print-module-deps

F.

--list-reduced-deps

Discussion
Question 22

Given:

java

try (FileOutputStream fos = new FileOutputStream("t.tmp");

ObjectOutputStream oos = new ObjectOutputStream(fos)) {

fos.write("Today");

fos.writeObject("Today");

oos.write("Today");

oos.writeObject("Today");

} catch (Exception ex) {

// handle exception

}

Which statement compiles?

Options:

A.

fos.write("Today");

B.

fos.writeObject("Today");

C.

oos.write("Today");

D.

oos.writeObject("Today");

Discussion
Question 23

Given:

java

DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);

Predicate doublePredicate = d -> d < 5;

System.out.println(doubleStream.anyMatch(doublePredicate));

What is printed?

Options:

A.

Compilation fails

B.

true

C.

false

D.

An exception is thrown at runtime

E.

3.3

Discussion
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